Technical guide No. 4 Guide to variable speed drives 7 Chapter 1 Introduction General This guide continues ABBs technical guide series, describing different variable speed drives VSD and how they are used in industrial processes. Special attention has been given to electrical VSDs and especially to AC Drives.
Variablespeed drives for belt conveyor systems, Nov 2000 2 ABB Process Industries Open Pit Mining amp Materials Handling, CottbusGermany Introduction More and more frequently, modern beltconveyor systems are equipped with variablespeed drives on the basis of frequency converters connected with standard squirrelcage motors and gearboxes.
Conveyor Controls can be simple onoff varieties, slightly more sophisticated softstart types which cushion loads upon startup, or variable frequency drives that can control the speed, acceleration, etc. of ac motors. Very long belt conveyors transporting ore and other products often rely on conveyor belt idlers to form troughs in the belts to
There is a strong trend for variable speed fixed conveyors to be driven by a threephase AC motor working with a variable frequency drive VFD. The use of DC motors to drive variable speed belt conveyors is declining because of the lower motor and control cost and high reliability of the AC motorVFD concept. See figure 13.
Adjustable speed drives are used to control the operation of many of the conveyors used in a wide variety of industries. This article discusses the role of speed control in conveyor applications and presents the factors that should be considered in selecting and applying adjustable speed drives.
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ncreasingly, the advantages of using variable frequency drives VFDs are expanding their use as the starter of choice, not only in applications that require speed control but also in applications that require torque control and mechanical soft starting. Conveyor belt application is one such example.
Variable Torque vs Constant Torque on AC drives. Product Line All Altivar ATV drives Cause Application notes about VT and CT loads Resolution VARIABLE TORQUE LOADS Many types of loads require reduced torque when driven at speeds less than the base speed of the load.
DrivePM Drive Parameter Manager is a PC tool for creating and editing parameter sets of variable speed drives to be suitable for FlashDrop unit. DriveConfig The DriveConfig kit is a new drive configuration tool for ABB component drives, ACS55, offering fast and safe configuration of unpowered drives.
Assists users in proper selection and application of alternate current AC adjustable speed drive systems. It covers AC electrical drive systems rated 600 V or less, consisting of threephase induction motors, voltagesource pulsewidth modulated adjustable frequency controls, and associated components.
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Many serious belt tracking and general conveyor issues result from trying to push a load with a belt conveyor rather than pull it. If a conveyor is supplied with an end drive, it is recommended that it be used in a onedirection application to pull its load, never to push it.
In a single chain conveyor situation, the drive type is Eddy Current, up to 10 HP, with basic speed control on single drive conveyors. Where the conveyor is extremely long, multiple drives are used and distributed around the chain path. Clutch coils are connected in parallel or masterslave controls are used to provide equal drive torques.
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All Altivar ATV drives. Application notes about VT and CT loads. Many types of loads require reduced torque when driven at speeds less than the base speed of the load. Conversely, such loads may require increased torque when driven at speeds greater than the base speed of the load. These are classified as variable torque loads.
Variablespeed drives can also run a motor in specialized patterns to further minimize mechanical and electrical stress. For example, an Scurve pattern can be applied to a conveyor application for smoother deceleration and acceleration control, which reduces the backlash that can occur when a conveyor is accelerating or decelerating.
The VLT AutomationDrive FC301 FC302 is designed for variable speed control of all asynchronous motors and permanent magnet motors. It comes in a standard version FC301 and an advanced high dynamic version FC302 with additional functionalities.
Installing multiple motors on long conveyors is common practice. Apply drives to ensure load sharing between each motor for reliable operation and to maximize belt life. Danfoss drives include both MasterMaster and MasterFollower control solutions for this. The VLT AutomationDrive FC301 FC302 is designed for variable speed control of
Variable Frequency Drive VFD can be used in lots of fields. Variable frequency drives are widely used to control the speed of AC motors, like conveyor systems, blower speeds, pump speeds, machine tool speeds, amp other applications that require variable speed with variable torque. In some applications such as speed control for a conveyor, the
Variable speed belt drives achieve the versatility needed to maximize application efficiency and productivity while remaining an inexpensive solution. In the most typical installation, a belt connects a variable speed pulley to a driven sheave. The pulley is then mounted on a motor shaft and the motor is at constant speed.
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